31200650561 has 2 divisors, whose sum is σ = 31200650562. Its totient is φ = 31200650560.

The previous prime is 31200650543. The next prime is 31200650623. The reversal of 31200650561 is 16505600213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30526728961 + 673921600 = 174719^2 + 25960^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200650561 - 2¹⁰ = 31200649537 is a prime.

It is a super-2 number, since 2×31200650561² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31200650501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600325280 + 15600325281.

It is an arithmetic number, because the mean of its divisors is an integer number (15600325281).

Almost surely, 2^31200650561 is an apocalyptic number.

It is an amenable number.

31200650561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31200650561 is an equidigital number, since it uses as much as digits as its factorization.

31200650561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The spelling of 31200650561 in words is "thirty-one billion, two hundred million, six hundred fifty thousand, five hundred sixty-one".